字符连续出现次数

package com.a.b;public class StringAnalysis {public static void main(String[] args) {//功能、边界、特殊值测试String string = "  aaacc   c  ";// "   ";//null;//"aabbcccd";System.out.println(transfer(string));}private static String transfer(String source) {if (null == source || source.equals("")) {System.out.println("transfer source is null");return null;}StringBuilder sb = new StringBuilder();int length = source.length();int count = 1;int i = 0;for (; i < length - 1; i++) {if (source.charAt(i) == source.charAt(i + 1)) {count++;} else {sb.append(source.charAt(i)).append(count);count = 1;}}if (source.charAt(i) != source.charAt(i - 1)) {count = 1;}sb.append(source.charAt(i)).append(count);return sb.toString();}}